Ganeti Setup & Walk-thru Guide. 3-node cluster using Vagrant & VirtualBox All setup using puppet Need to install git, VirtualBox, & Vagrant
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1 Ganeti Setup & Walk-thru Guide 3-node cluster using Vagrant & VirtualBox All setup using puppet Need to install git, VirtualBox, & Vagrant
2 Repo & Vagrant Setup Make sure you have hardware virtualization enabled in your BIOS prior to running VirtualBox. You will get an error from VirtualBox while starting the VM if you don t it enabled. gem install vagrant git clone git://github.com/ramereth/vagrant-ganeti.git git submodule update --init
3 Starting up & accessing the nodes The Vagrantfile is setup to where you can deploy one, two, or three nodes depending on your use case. Node1 will have Ganeti already initialized while the other two will only have Ganeti installed and primed. For more information on how to use Vagrant, please check out their site. NOTE: Root password is 'vagrant' on all nodes. # Starting a single node (node1) vagrant up node1 vagrant ssh node1 # Starting node2 vagrant up node2 vagrant ssh node1 gnt-node add -s node2 # Starting node3 vagrant up node3 vagrant ssh node1 gnt-node add -s node3
4 What Vagrant will do for you 1. Install all dependencies required for Ganeti 2. Setup the machine to function as a Ganeti node 3. Install Ganeti, Ganeti Htools, and Ganeti Instance Image 4. Setup and initialize Ganeti (node1 only)
5 Installing Ganeti We ve already installed Ganeti for you on the VMs, but here are the steps that we did for documentation purposes. tar -zxvf ganeti tar.gz cd ganeti /configure --localstatedir=/var --sysconfdir=/etc && /usr/bin/make && /usr/bin/install cp doc/examples/ganeti.initd /etc/init.d/ganeti && chmod +x /etc/init.d/ganeti update-rc.d ganeti defaults 20 80
6 Initialize Ganeti Ganeti will be already initialized on node1 for you, but here are the steps that we did. Be aware that Ganeti is very picky about extra spaces in the -H kvm: line. gnt-cluster init \ --vg-name=ganeti -s \ --master-netdev=br0 \ -I hail \ -H kvm:kernel_path=/boot/vmlinuz-kvmu, \ initrd_path=/boot/initrd-kvmu, \ root_path=/dev/sda2,nic_type=e1000,disk_type=scsi, \ vnc_bind_address= , serial_console=true \ -N link=br0 --enabled-hypervisors=kvm \ ganeti.example.org
7 Testing the cluster: verify gnt-cluster verify Submitted jobs 4, 5 Waiting for job 4... Thu Jun 7 06:03: * Verifying cluster config Thu Jun 7 06:03: * Verifying cluster certificate files Thu Jun 7 06:03: * Verifying hypervisor parameters Thu Jun 7 06:03: * Verifying all nodes belong to an existing group Waiting for job 5... Thu Jun 7 06:03: * Verifying group 'default' Thu Jun 7 06:03: * Gathering data (1 nodes) Thu Jun 7 06:03: * Gathering disk information (1 nodes) Thu Jun 7 06:03: * Verifying configuration file consistency Thu Jun 7 06:03: * Verifying node status Thu Jun 7 06:03: * Verifying instance status Thu Jun 7 06:03: * Verifying orphan volumes Thu Jun 7 06:03: * Verifying N+1 Memory redundancy Thu Jun 7 06:03: * Other Notes Thu Jun 7 06:03: * Hooks Results
8 Testing the cluster: list nodes gnt-node list Node DTotal DFree MTotal MNode MFree Pinst Sinst node1.example.org 26.0G 25.5G 744M 186M 587M 0 0 node2.example.org 26.0G 25.5G 744M 116M 650M 0 0
9 Adding an Instance gnt-os list Name image+cirros image+default gnt-instance add -n node1 -o image+cirros -t plain -s 1G \ --no-start instance1 Thu Jun 7 06:05: * disk 0, vg ganeti, name 780af fa de disk0 Thu Jun 7 06:05: * creating instance disks... Thu Jun 7 06:05: adding instance instance1.example.org to cluster config Thu Jun 7 06:05: INFO: Waiting for instance instance1.example.org to sync disks. Thu Jun 7 06:05: INFO: Instance instance1.example.org's disks are in sync. Thu Jun 7 06:05: * running the instance OS create scripts...
10 Listing Instance Information gnt-instance list Instance Hypervisor OS Primary_node Status Memory instance1.example.org kvm image+cirros node1.example.org ADMIN_down -
11 Listing Instance Information gnt-instance info instance1 Instance name: instance1.example.org UUID: bb87da5b-05f9-4dd6-9bc c1e091f Serial number: 1 Creation time: :05:58 Modification time: :05:58 State: configured to be down, actual state is down Nodes: - primary: node1.example.org - secondaries: Operating system: image+cirros Allocated network port: Hypervisor: kvm - console connection: vnc to node1.example.org:11000 (display 5100) Hardware: - VCPUs: 1 - memory: 128MiB - NICs: - nic/0: MAC: aa:00:00:dd:ac:db, IP: None, mode: bridged, link: br0 Disk template: plain Disks: - disk/0: lvm, size 1.0G access mode: rw logical_id: ganeti/780af fa de disk0 on primary: /dev/ganeti/780af fa de disk0 (252:1)
12 Controlling Instances gnt-instance start instance1 Waiting for job 10 for instance1.example.org... gnt-instance console instance1 login as 'vagrant' user. default password: 'vagrant'. use 'sudo' for root. cirros login: # Press crtl+] to escape console. root@node1:~# gnt-instance shutdown instance1 Waiting for job 11 for instance1.example.org...
13 Changing the Disk Type gnt-instance shutdown instance1 Waiting for job 11 for instance1.example.org... gnt-instance modify -t drbd -n node2 instance1 Thu Jun 7 06:09: Converting template to drbd Thu Jun 7 06:09: Creating aditional volumes... Thu Jun 7 06:09: Renaming original volumes... Thu Jun 7 06:09: Initializing DRBD devices... Thu Jun 7 06:09: INFO: Waiting for instance instance1.example.org to sync disks. Thu Jun 7 06:09: INFO: - device disk/0: 5.10% done, 20s remaining (estimated) Thu Jun 7 06:09: INFO: - device disk/0: 86.00% done, 3s remaining (estimated) Thu Jun 7 06:09: INFO: - device disk/0: 98.10% done, 0s remaining (estimated) Thu Jun 7 06:09: INFO: Instance instance1.example.org's disks are in sync. Modified instance instance1 - disk_template -> drbd Please don't forget that most parameters take effect only at the next start of the instance.
14 Instance Failover gnt-instance failover -f instance1 Thu Jun 7 06:10: INFO: Not checking memory on the secondary node as instance will not be started Thu Jun 7 06:10: Failover instance instance1.example.org Thu Jun 7 06:10: * not checking disk consistency as instance is not running Thu Jun 7 06:10: * shutting down instance on source node Thu Jun 7 06:10: * deactivating the instance's disks on source node
15 Instance Migration gnt-instance start instance1 Waiting for job 14 for instance1.example.org gnt-instance migrate -f instance1 Thu Jun 7 06:10: Migrating instance instance1.example.org Thu Jun 7 06:10: * checking disk consistency between source and target Thu Jun 7 06:10: * switching node node1.example.org to secondary mode Thu Jun 7 06:10: * changing into standalone mode Thu Jun 7 06:10: * changing disks into dual-master mode Thu Jun 7 06:10: * wait until resync is done Thu Jun 7 06:10: * preparing node1.example.org to accept the instance Thu Jun 7 06:10: * migrating instance to node1.example.org Thu Jun 7 06:10: * switching node node2.example.org to secondary mode Thu Jun 7 06:10: * wait until resync is done Thu Jun 7 06:10: * changing into standalone mode Thu Jun 7 06:10: * changing disks into single-master mode Thu Jun 7 06:10: * wait until resync is done Thu Jun 7 06:10: * done
16 Master Failover gnt-cluster master-failover gnt-cluster getmaster node2.example.org gnt-cluster master-failover
17 Job Operations gnt-job list ID Status Summary 1 success CLUSTER_POST_INIT 2 success CLUSTER_SET_PARAMS 3 success CLUSTER_VERIFY 4 success CLUSTER_VERIFY_CONFIG 5 success CLUSTER_VERIFY_GROUP(8e97b380-3d86-4d3f-a1c5-c7276edb8846) 6 success NODE_ADD(node2.example.org) 7 success OS_DIAGNOSE 8 success INSTANCE_CREATE(instance1.example.org) 9 success INSTANCE_QUERY_DATA 10 success INSTANCE_STARTUP(instance1.example.org) 11 success INSTANCE_SHUTDOWN(instance1.example.org) 12 success INSTANCE_SET_PARAMS(instance1.example.org) 13 success INSTANCE_FAILOVER(instance1.example.org) 14 success INSTANCE_STARTUP(instance1.example.org) 15 success INSTANCE_MIGRATE(instance1.example.org)
18 Job Operations gnt-job info 14 Job ID: 14 Status: success Received: :10: Processing start: :10: (delta s) Processing end: :10: (delta s) Total processing time: seconds Opcodes: OP_INSTANCE_STARTUP Status: success Processing start: :10: Execution start: :10: Processing end: :10: Input fields: beparams: {} comment: None debug_level: 0 depends: None dry_run: False force: False hvparams: {} ignore_offline_nodes: False instance_name: instance1.example.org no_remember: False priority: 0 startup_paused: False No output data Execution log:
19 Using Htools gnt-instance add -I hail -o image+cirros -t drbd -s 1G --no-start instance2 Thu Jun 7 06:14: INFO: Selected nodes for instance instance2.example.org via iallocator hail: node2.example.org, node1.example.org Thu Jun 7 06:14: * creating instance disks... Thu Jun 7 06:14: adding instance instance2.example.org to cluster config Thu Jun 7 06:14: INFO: Waiting for instance instance2.example.org to sync disks. Thu Jun 7 06:14: INFO: - device disk/0: 6.30% done, 16s remaining (estimated) Thu Jun 7 06:14: INFO: - device disk/0: 73.20% done, 6s remaining (estimated) Thu Jun 7 06:14: INFO: - device disk/0: % done, 0s remaining (estimated) Thu Jun 7 06:14: INFO: Instance instance2.example.org's disks are in sync. Thu Jun 7 06:14: * running the instance OS create scripts... root@node1:~# gnt-instance list Instance Hypervisor OS Primary_node Status Memory instance1.example.org kvm image+cirros node1.example.org running 128M instance2.example.org kvm image+cirros node2.example.org ADMIN_down -
20 Using Htools: hbal hbal -L Loaded 2 nodes, 2 instances Group size 2 nodes, 2 instances Selected node group: default Initial check done: 0 bad nodes, 0 bad instances. Initial score: Trying to minimize the CV instance1 node1:node2 => node2:node a=f Cluster score improved from to Solution length=1 root@node1:~# hbal -L -X Loaded 2 nodes, 2 instances Group size 2 nodes, 2 instances Selected node group: default Initial check done: 0 bad nodes, 0 bad instances. Initial score: Trying to minimize the CV instance1 node1:node2 => node2:node a=f Cluster score improved from to Solution length=1 Executing jobset for instances instance1.example.org Got job IDs 18
21 Using Htools: hspace hspace --memory disk L The cluster has 2 nodes and the following resources: MEM 1488, DSK 53304, CPU 4, VCPU 256. There are 2 initial instances on the cluster. Normal (fixed-size) instance spec is: MEM 128, DSK 1024, CPU 1, using disk template 'drbd'. Normal (fixed-size) allocation results: - 2 instances allocated - most likely failure reason: FailMem - initial cluster score: final cluster score: memory usage efficiency: 34.41% - disk usage efficiency: 18.25% - vcpu usage efficiency: 1.56%
22 Recovering from a Node Failure # Setup node3 gnt-node add -s node3 # You should see something like the following now: root@node1:~# gnt-node list Node DTotal DFree MTotal MNode MFree Pinst Sinst node1.example.org 26.0G 23.3G 744M 213M 585M 1 1 node2.example.org 26.0G 23.3G 744M 247M 542M 1 1 node3.example.org 26.0G 25.5G 744M 114M 650M 0 0
23 Simulating a node failure # Log out of node1 vagrant halt -f node2 # Log back into node1 gnt-cluster verify gnt-node modify -O yes -f node2 gnt-cluster verify gnt-node failover --ignore-consistency node2 gnt-node evacuate -I hail -s node2 gnt-cluster verify
24 Re-adding node2 # Log out of node1 vagrant destroy -f node2 vagrant up node2 # Log back into node1 gnt-node add --readd node2 gnt-cluster verify
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